/*---------------------------------------------------------------
 * Confidential and Proprietary
 * Copyright 2006 CMO & Hewlett-Packard Development Company, L.P.
 * All Rights Reserved
 * 
 * Project Name    : SPF
 * Sub Project Name: SPF
 *
 * File Name       : ByteArrayDataSource.java
 *
 * Modification Log:
 *   Date          Ver.#      By            Description
 *   Nov 8, 2006       1.0       zhangzhm        Created
 *---------------------------------------------------------------
 */
package com.erdos.common.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;

import javax.activation.DataSource;

/**
 * <p>ByteArrayDataSource is for Mail DataSource</p>
 * @version     1.0     <br/>
 * @author      zhangzhm    
 */
public class ByteArrayDataSource  implements DataSource {
    private byte[] data;    // data
    private String type;    // content-type

    /* Create a DataSource from an input stream */
    public ByteArrayDataSource(InputStream is, String type) {
        this.type = type;
        try {
            ByteArrayOutputStream os = new ByteArrayOutputStream();
            int ch;

            while ((ch = is.read()) != -1)
                    // XXX - must be made more efficient by
                // doing buffered reads, rather than one byte reads
                os.write(ch);
            data = os.toByteArray();

        } catch (IOException ioex) { }
    }

    /* Create a DataSource from a byte array */
    public ByteArrayDataSource(byte[] data, String type) {
        this.data = data;
        this.type = type;
    }

    /* Create a DataSource from a String */
    public ByteArrayDataSource(String data, String type,String charset) {
        try {
            // Assumption that the string contains only ASCII
            // characters!  Otherwise just pass a charset into this
            // constructor and use it in getBytes()
            this.data = data.getBytes(charset);
        } catch (UnsupportedEncodingException uex) { }
        this.type = type;
    }

    /**
     * Return an InputStream for the data.
     * Note - a new stream must be returned each time.
     */
    public InputStream getInputStream() throws IOException {
        if (data == null)
            throw new IOException("no data");
        return new ByteArrayInputStream(data);
    }

    public OutputStream getOutputStream() throws IOException {
        throw new IOException("cannot do this");
    }

    public String getContentType() {
        return type;
    }

    public String getName() {
        return "dummy";
    }
}

